ergo
template_lapack_laisnan.h
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1 /* Ergo, version 3.8, a program for linear scaling electronic structure
2  * calculations.
3  * Copyright (C) 2019 Elias Rudberg, Emanuel H. Rubensson, Pawel Salek,
4  * and Anastasia Kruchinina.
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program. If not, see <http://www.gnu.org/licenses/>.
18  *
19  * Primary academic reference:
20  * Ergo: An open-source program for linear-scaling electronic structure
21  * calculations,
22  * Elias Rudberg, Emanuel H. Rubensson, Pawel Salek, and Anastasia
23  * Kruchinina,
24  * SoftwareX 7, 107 (2018),
25  * <http://dx.doi.org/10.1016/j.softx.2018.03.005>
26  *
27  * For further information about Ergo, see <http://www.ergoscf.org>.
28  */
29 
30  /* This file belongs to the template_lapack part of the Ergo source
31  * code. The source files in the template_lapack directory are modified
32  * versions of files originally distributed as CLAPACK, see the
33  * Copyright/license notice in the file template_lapack/COPYING.
34  */
35 
36 
37 #ifndef TEMPLATE_LAPACK_LAISNAN_HEADER
38 #define TEMPLATE_LAPACK_LAISNAN_HEADER
39 
40 template<class Treal>
41 logical template_lapack_laisnan(Treal *din1, Treal *din2)
42 {
43  /* System generated locals */
44  logical ret_val;
45 
46 
47 /* -- LAPACK auxiliary routine (version 3.2) -- */
48 /* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
49 /* November 2006 */
50 
51 /* .. Scalar Arguments .. */
52 /* .. */
53 
54 /* Purpose */
55 /* ======= */
56 
57 /* This routine is not for general use. It exists solely to avoid */
58 /* over-optimization in DISNAN. */
59 
60 /* DLAISNAN checks for NaNs by comparing its two arguments for */
61 /* inequality. NaN is the only floating-point value where NaN != NaN */
62 /* returns .TRUE. To check for NaNs, pass the same variable as both */
63 /* arguments. */
64 
65 /* A compiler must assume that the two arguments are */
66 /* not the same variable, and the test will not be optimized away. */
67 /* Interprocedural or whole-program optimization may delete this */
68 /* test. The ISNAN functions will be replaced by the correct */
69 /* Fortran 03 intrinsic once the intrinsic is widely available. */
70 
71 /* Arguments */
72 /* ========= */
73 
74 /* DIN1 (input) DOUBLE PRECISION */
75 /* DIN2 (input) DOUBLE PRECISION */
76 /* Two numbers to compare for inequality. */
77 
78 /* ===================================================================== */
79 
80 /* .. Executable Statements .. */
81  ret_val = *din1 != *din2;
82  return ret_val;
83 } /* dlaisnan_ */
84 
85 #endif
template_lapack_laisnan
logical template_lapack_laisnan(Treal *din1, Treal *din2)
Definition: template_lapack_laisnan.h:41
logical
bool logical
Definition: template_blas_common.h:41